![]() Another benefit of this approach is that it is also the easiest to incorporate with functions such as Round(). It's sometimes referred to as the "universal solution" since it works in all databases. Not all databases support the OVER() clause, so the subquery approach can be a very valuable fallback solution. Perhaps the next option will be more to your liking. ![]() Unfortunately, that's not easily done using the over() clause. Looks good, but some rounding wouldn't hurt. Here's the formula to obtain a percentage:Īdding the above SQL to our original query produces the following results: The OVER clause is the most efficient way to calculate row percentages in SQL, so it should be your first choice if efficiency is a priority for you. Used predominantly with Window Functions, the OVER clause is used to determine which rows from the query are applied to the function, what order they are evaluated in by that function, and when the function's calculations should restart. The rest of this blog will explore each of these in turn.
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